Perhaps the biggest problem for World War Z's sequel is what to call it. World War Z 2? World War Zour? World War Z: Zed's Dead? Then there's possibilty of the threequel's name being World War Z 3, which doesn't even bear thinking about. And yet, it is under consideration, as Brad Pitt revealed to the press at this year's Toronto Film Festival.

“We’re certainly talking about it, yes,” he told Variety. “We have so many ideas on the table from the time we spent developing this thing and figuring out how the zombie worlds work. We gotta get the script right first to determine if we go further.”

Very loosely based on Max "Son of Mel" Brooks' apocalyptic zombie novel World War Z, the Marc Forster movie cost nearly $200 million to make - thanks, in part, to lengthy third act reshoots that led many to believe it would be a cast-iron clanger on release - but has so far made $533 million at the worldwide box office.

This makes it Brad Pitt's highest grossing movie, and a big win for production company Plan B, which also happens to be run by Pitt. The actor is in Toronto for 12 Years A Slave, the latest film from Steve Mc Queen which is already getting rapturous reviews and which hits UK screens on January 24. He also has Ridley Scott's The Counsellor coming up.

Since the first World War Z film jettisoned much of the original book's material, including, most tantalisingly, zombies walking across the ocean floor, there's still much to look forward to should the sequel officially start production. In the meantime, have a listen to our fascinating Max Brooks Empire Podcast interview below, and be sure to subscribe to itvia our iTunes page or this handy RSS feed.

So what should they call it?

World War Zwo

World War Z: Zack's Back

World War O (to be followed by World Wars M, B, I & E

World War Z For Zachariah - well, it has about as much to do with that book.

L: galvatron
Didn't they cure the plague?
ope, just "camouflaged" against it by infecting themselves with other diseases. The zombies only went for people who weren't afflicted with a disease, making them invisible More